Github user edespino commented on the issue:
https://github.com/apache/madlib/pull/189
@rahiyer - Collaborating with Lisa Owen (@lisakowen - providing excellent
editorial know-how), I have added the following note to the Pivot Literature
link section:
```
NOTE: The following links refer to documentation resources for the
current PostgreSQL database version. Depending upon your database
platform version, you may need to change "current" references in the
links to your database version.
If your database platform uses the Greenplum Database (or related
variants), please check with the project community and/or your
database vendor to identify the PostgreSQL version it is based on.
```
---
